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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790e7cb640c0ed0fa97eb6d6f0f6c2b20540bc1f1378e85a0e383884c07d27b8' 
  AND token = 'u4H+SLoOBbQXXGXuKlyNFYDm7h9DNVk3/ggNMwUPu7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}